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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It's a problem with your code, you're misusing sort. Use a better suited method for that. Sort is not stable in javascript.
Try your code in repl.it and you'll see it also fails there.
Not a kata issue:
It doesn't rerun them when you submit.
Running sample tests are simply examples, to get the full test suite click 'attempt'.